Enhanced extra-long life fatigue resistance of a bimodal titanium alloy by laser shock peening

Kun Yang, Qi Huang, Bin Zhong, Qingyuan Wang, Qiang Chen, Yao Chen, Ning Su, Hanqing Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Ultrasonic fatigue tests were performed on notched specimens to investigate high and very high cycle fatigue behaviors in the laser shock peened region of a compressor blade titanium alloy (Ti–8Al–1Mo–1V). The plastic deformation and compressive residual stress, induced by the laser shock peening (LSP), present gradient distributions along the depth direction. High-angle grain boundaries (HAGB, >15°) are increased by deformation twins, which are introduced into primary α phases during the plastic deformation. The enhancement in fatigue resistance is ascribed to the comprehensive retardation effects of the compressive residual stress, high-density dislocations, and HAGBs.

Original languageEnglish
Article number105868
JournalInternational Journal of Fatigue
Volume141
DOIs
Publication statusPublished - Dec 2020

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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